/***********************************************************
* Program: officeHours
* Introduction: 
* 		A C program that uses pThreads and semaphores to \
* synchronize a TA and students during office hours.
* Author: liang
* Date: 2014/3/21
* Copyrights applied to GPL and open source limitations.
***********************************************************/

/***********************************************************
[Detailed Instructions]
-  Only one person is speaking at a time.
-  The TA answers each question from a student.
-  No student asks another question before the TA is done answering the previous 
question.
-  A student can only ask one question when they get a chance to ask a question.
-  The TA and the students must be synchronized so that when a student asks their 
question the next person to speak is the TA with the answer.
-  A limited number of students are allowed in the TA's office.
-  Students will wait if the office is full.
-  A  student  does  not  leave  the  TA's  office  until  all their questions  have  been 
answered.
-  There is only one TA but there may be multiple students. 
-  You do not know the order of students in asking questions.
***********************************************************/

/***********************************************************
Instructions:
1. Compile
> gcc -o officeHours officeHours.c -lpthread -lrt
2. Execute
> officeHours <number1> <number2> <number3>
Where - number1, number2, number3 as:
number1: number of students that will come during office hours
number2: number of students allowed into the TA's office
number3: number of questions each student may ask
***********************************************************/